@movim I disabled every single extensions one by one and sometimes the problem was there and sometimes the behaviour I discribed (one second of scrolling then nothing. )
I didn't try to disable extension by pairs, to much work. 
@movim I disabled every single extensions one by one and sometimes the problem was there and sometimes the behaviour I discribed (one second of scrolling then nothing. )
I didn't try to disable extension by pairs, to much work. 
@movim When I disable some extension the scroll is available for one second and then is disactivated.
If Iβ―restart Firefox in 'troubleshoot mode' the scroll works well.
I'm not sure that relative to the extensions, maybe the webworkers ?β―
@movim Hi, congratulation for these wonderfull steps !
Here is a bug report for the blog, when Iβ―open the link I cannot scroll on the page. If I open the same link in a private window Iβ―can use the website and scroll through. I use firefox.
Here is a screenshoot.
I'm open to test with you if needed.